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An exercise machine includes a base, a seat mounted on the base and provided with a backrest, a leg-exercising mechanism mounted on the base, and two hand grips connected to the leg-exercising mechanism. The seat and the backrest are provided with two rocking frames fastened thereto. The rocking fra

An exercise machine includes a base, a seat mounted on the base and provided with a backrest, a leg-exercising mechanism mounted on the base, and two hand grips connected to the leg-exercising mechanism. The seat and the backrest are provided with two rocking frames fastened thereto. The rocking frames are provided with a straight support portion, and an arcuate portion capable of a rocking act to cause the backrest to rest on a floor surface by the straight support portion of the rocking frames. The arcuate portion is further capable of the rocking act to cause the backrest to revert to the previous upright position relative to the floor surface.

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1. An exercise machine comprising: a base rested on a floor surface; a seat mounted on one end of said base; a backrest extending from said seat; a leg-exercising mechanism mounted on an opposite end of said base such that said leg-exercising mechanism is opposite to said seat, said leg-exerci

1. An exercise machine comprising: a base rested on a floor surface; a seat mounted on one end of said base; a backrest extending from said seat; a leg-exercising mechanism mounted on an opposite end of said base such that said leg-exercising mechanism is opposite to said seat, said leg-exercising mechanism comprising two crank arms, a damping device, and two pedals fastened to said two crank arms; and two hand grips connected to said two crank arms by an elastic pull cord; wherein said seat and said backrest are comprised of two rocking frames, each frame comprising a curved rod with a top segment, a straight bottom segment, an arcuate segment extending from said straight bottom segment, and a straight support segment located between said top segment and said arcuate segment, said top segment being fastened to an outer side of said backrest, said straight bottom segment being fastened to an underside of said seat, said arcuate segment having a radian corresponding to one fourth of a circular radian whereby said arcuate segment is capable of a rocking act to cause said backrest to rest on the floor surface by said straight support segment at such time when an inner side of said backrest is exerted on by a force of a person seated on said seat, said arcuate segment further being capable of the rocking act to cause said seat to rest on the floor surface by said straight bottom segment at such time when said seat is exerted on by a force of the person seated on said seat. 2. The exercise machine as defined in claim 1, wherein each of said two rocking frames is a slat whereby said slat is fastened to the outer side of said backrest and the underside of said seat and is comprised of an arcuate portion and a straight support portion, said arcuate portion having a radian corresponding to one fourth of the circular radian, said arcuate portion being capable of a rocking act to cause said backrest to rest on the floor surface by said straight support portion at such time when said backrest is exerted on by a force of a person seated on said seat, said arcuate portion further being capable of the rocking act to cause said seat to rest on the floor surface at such time when said seat is exerted on by a force of the person seated on said seat.